1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright (c) 2024 Google LLC */
3
4 #include "vmlinux.h"
5
6 #include <string.h>
7 #include <bpf/bpf_helpers.h>
8 #include <bpf/bpf_endian.h>
9 #include <bpf/bpf_core_read.h>
10 #include "bpf_kfuncs.h"
11
12 #define REWRITE_ADDRESS_IP6_0 0xfaceb00c
13 #define REWRITE_ADDRESS_IP6_1 0x12345678
14 #define REWRITE_ADDRESS_IP6_2 0x00000000
15 #define REWRITE_ADDRESS_IP6_3 0x0000abcd
16
17 #define REWRITE_ADDRESS_PORT6 6060
18
19 SEC("cgroup/getpeername6")
20 int getpeername_v6_prog(struct bpf_sock_addr *ctx)
21 {
22 ctx->user_ip6[0] = bpf_htonl(REWRITE_ADDRESS_IP6_0);
23 ctx->user_ip6[1] = bpf_htonl(REWRITE_ADDRESS_IP6_1);
24 ctx->user_ip6[2] = bpf_htonl(REWRITE_ADDRESS_IP6_2);
25 ctx->user_ip6[3] = bpf_htonl(REWRITE_ADDRESS_IP6_3);
26 ctx->user_port = bpf_htons(REWRITE_ADDRESS_PORT6);
27
28 return 1;
29 }
30
31 char _license[] SEC("license") = "GPL";
32
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